I will not bore you with long posts this afternoon. To recharge online wherever you are, here are the basic things you need:

-An internet-enabled device such as a mobile phone or PC.
-Meter number (usually written on the body of the meter)
-Phone number (The token is sent to this number)
-Email address
-Master/Visa card (for online payment)

Once you have all these, then read this short guide - https://www.nepa.ng/blog/prepaid-electricity/how-to-recharge-your-prepaid-meter-online-using-nepa-ng/